tab completion barfs in inferior process

[tyler <tyler.smith@mail.mcgill.ca>]

Hi,

I am running R in an ESS buffer in Emacs 23.0.60.1. ESS provides tab
completion for objects, but sometimes it barfs up multiple lines of
elisp in the mini-buffer instead of actually doing any completing. I
thought this was an ESS problem, until I realized that the same thing
was happening in *shell*, so I figure it has something to do with comint
mode (which ESS uses).

The problem is not consistently reproducible, but this is what I see now
in my *shell* buffer:

tyler:r-> ls h*
hubbell.R  hubbell.R~  hump4com.csv  hump4.csv	hump4env.csv  hump4pcnm.csv  hump4XY.csv

If I type h<tab> at the prompt I see the following message in the
minibuffer (recovered from the *Messages* buffer):

Completing command name...
comint-dynamic-simple-complete: Wrong number of arguments: (lambda (completions) "List in help buffer sorted COMPLETIONS.
Typing SPC flushes the help buffer." (let ((window (get-buffer-window "*Completions*"))) (setq completions (sort completions (quote string-lessp))) (if (and (eq last-command this-command) window (window-live-p window) (window-buffer window) (buffer-name (window-buffer window)) (equal completions (buffer-local-value (quote comint-displayed-dynamic-completions) (window-buffer window)))) (with-current-buffer (window-buffer window) (if (pos-visible-in-window-p (point-max) window) (set-window-start window (point-min)) (save-selected-window (select-window window) (scroll-up)))) (setq comint-dynamic-list-completions-config (current-window-configuration)) (with-output-to-temp-buffer "*Completions*" (display-completion-list completions)) (message "Type space to flush; repeat completion command to scroll")) (let (key first) (if (with-current-buffer (get-buffer "*Completions*") (set (make-local-variable (quote comint-displayed-dynamic-completions)) completions) (setq key (read-key-sequence nil) first (aref key 0)) (and (consp first) (consp (event-start first)) (eq (window-buffer (posn-window (event-start first))) (get-buffer "*Completions*")) (eq (key-binding key) (quote mouse-choose-completion)))) (progn (mouse-choose-completion first) (set-window-configuration comint-dynamic-list-completions-config)) (unless (eq first 32) (setq unread-command-events (listify-key-sequence key))) (unless (eq first 9) (set-window-configuration comint-dynamic-list-completions-config)))))), 2
Mark set

If I open up a new instance of emacs, M-x shell, and go to the same
directory, h<tab> gives me a completion buffer, although it only
contains possible commands in my path, and none of the files in the
directory that start with h.

Any ideas what I've done wrong, or is this a bug of some sort?

Thanks,

Tyler
--